50. Mr. Green is said _____ an
experiment to prove the new method of solving the problem when young.
A. to
do
B. to have done
C. to be
doing
D. to have been doing
湖南 刘良求 岳巧玲
山东 丁道文 周静 广东 许爱平
答案及部分解析:
1-5
CDDAD 6-10 DDCAB
11-15 BDABC 16-20 CACDB 21-25
CDCDA
26-30
DDBBD 31-35 ADDBC 36-40
ACCAB 41-45 CDABB 46-50 ADABB